What can spectroscopes tell us about a space object?
2 answers:
Answer:
Explanation:
<h2><u>Spectroscope:</u></h2>- The device used to tell the properties of the spectral lines in an electromagnetic spectrum is called spectroscope.
- <u>For any space object, spectroscope tells:</u>
- Type of element the object is made of.
- Temperature of object.
- Chemical composition.
- Speed
- Magnetic and electric field.
- Spectroscope also can tell the light intensity and their wavelength.
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Answer:
300 J
Explanation:
First of all, we need to calculate the net force acting on the crate, which is given by:
where
F = 100 N is the horizontal push
is the force of friction
Substituting,
Now we can calculate the net work done on the crate:
where
d = 10 m is the displacement
Substituting,
According to the work-energy theorem, the kinetic energy gained by the crate is equal to the work done on it: therefore, the answer is 300 J.
The system of two rods will lie on the table as show in the figure
The center of first rod will lie exactly at the edge of first rod and then the center of mass of two combined rods will lie at the edge of the table.
So now the whole system will rest on the rod and it will not tipping off.
Since both rods are identical so we can say that the system will have its center of mass at the mid point on the line joining the two centers
So the value of x will be at mid point of line joining the two points on rod
So total length over the edge will be given as
